Phosphorylcholine (PC)-containing antigens were sought in 269 bacterial isolates from the mouth and respiratory tract by an enzyme immunoassay method. Only 41 (15%) isolates were PC-positive and of these 29 (70%) were strains of Other species that produced positive results included two of five isolates of , two of five isolates of spp., and a single strain each of sp., sp. and The presence of PC-containing antigens in may be an important source of cross-reaction in antigen detection techniques that detect the C-polysaccharide antigen of in respiratory specimens and would result in false positive results.


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